There is no reason to delete the thread. Op isn't asking how to break the law. He's asking advice about a ski with a bad Hin. It's a good question.
It's illegal to remove, tamper or swap a hin. People do it, and they get away with it, but that does not make it legal. The people who tell you that it is okay are giving bad advice. You should understand the risks of dealing and illegal or possibly stolen property.
All aftermarket hulls should be titled as home built, should be titled under the brand they were purchased as or be accompanied by a manufactured certificate of origin. It may also be acceptable to have a receipt of sale from a manufacture but that I don't know for sure on. Home built vessels need receipts of the materials and an inspection. A hin is assigned by the tax collector. Any ski that has a hin removed mush be done with the permission of the uscg after filing appropriate paperwork. Even a stock hull with matching hin is illegal if that hin has been removed or replaced without uscg paperwork.
You are welcome to make whatever choices you want. Just dont discuss your actions here if you decide to do something you are not suppose to. The site can not condone illegal actions.